/** this class represents a cubic polynomial */

public class Cubic {

  float a,b,c,d;         /* a + b*u + c*u^2 +d*u^3 */

  public Cubic(float a, float b, float c, float d){
    this.a = a;
    this.b = b;
    this.c = c;
    this.d = d;
  }

  
  /** evaluate cubic */
  public float eval(float u) {
    return (((d*u) + c)*u + b)*u + a;
  }
}